In this work, the Ra values will be used to measure the importance of the inputs and also to discard irrelevant inputs, guiding the variable selection algorithm. We will adopt the popular backward selection, which starts with all variables and iteratively deletes one input until a stopping criterion is met [14]. Yet, we guide the variable deletion (at each step) by the sensitivity analysis, in a variant that allows a reduction of the computational effort by a factor of I (when compared to the standard backward procedure) and that in [18] has out- performed other methods (e.g. backward and genetic algorithms). Similarly to [36], the variable and model selection will be performed simultaneously, i.e. in each backward iteration several models are searched, with the one that presents the best generalization estimate selected. For a given DM method, the overall procedure is depicted bellow: